胶原蛋白
collagen type I from calf skin; collagen type I from rat tail; Collagen calf skin; Collagen, Type V, Human Placenta; Collagen, Type IV, Human Placenta; Collagen, Type II, Bovine Joint Cartilage; Collagen, Type II, Mouse Sternum Cartilage; Collagen from human placenta; Collagen from rat tail
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